首阳山电厂670t/h调峰机组的锅炉设计

670t/h Boiler Design of Cycling Unit for Shouyangshan Power Plant

为了满足电网调峰、调频的需要,80年代初我国首次设计制造了带中间负荷的大型调峰机组锅炉。本文针对首阳山电厂670t/h锅炉调峰和燃用义马煤两大难题,介绍了锅炉的设计思想、基本结构和设计特点。锅炉设计突破了传统的设计方法,应用以应力分类为基础的设计方法,建立锅炉整体热膨胀体系和支吊体系,根据应力分析选取结构布置;借鉴国外先进的技术规范,首次提出了我国自己的低周疲劳寿命计算方法,对锅筒进行了较完整的低周疲劳寿命计算;同时在锅炉热力指标的选取、受热面和燃烧设备设计上都采取了有效措施,保证了锅炉调峰的安全可靠,性能良好。

In early 1980's, the first large capacity boiler for cycling unit with middle loading characteristic was designed and manufactured in our country, in order to meet the need of network in cycle loading and frequency modulation. This paper gives the introduction of boiler design principles, configuration of main components and design features in accordance with two difficult questions of cycle loading and Yima coal firing on 670t/h boiler for Shouyang-shan Power Plant. The conventional design method is abandoned through and then new design method is applied during the boiler desing. For example, design method based on stress classification is applied. Thermal expansion system and supporting system used for boiler proper are preset. And layout of structure is decided by stress analysis. Using the foreign advanced techlogical criteria for reference, a boiler life calculation method due to low-cycling fatigue is put forward first in our country. The steam drum life due to low-cycling fatigue is calculated completely by the method. Meanwhile,effective measures are taken in selection of furnace thermal parameters and design of heating surfaces and firing equipments to guarantee safety reliability and good preformance for cycling boiler.